Messages in this thread Patch in this message | | | Date | Fri, 18 Jul 2014 15:51:31 -0700 | From | Omar Sandoval <> | Subject | [PATCH] ARM: Don't oops when userspace executes kgdb break instructions. |
| |
Don't break into kgdb when userspace executes the kernel break instructions (KGDB_BREAKINST and KGDB_COMPILED_BREAK). The kernel will oops in kgdb_handle_exception.
Signed-off-by: Omar Sandoval <osandov@osandov.com> --- The following program will immediately cause a kernel oops: .globl _start _start: udf #65006 @ KGDB_BREAKINST
arch/arm/kernel/kgdb.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/arch/arm/kernel/kgdb.c b/arch/arm/kernel/kgdb.c index 778c2f7..a74b53c 100644 --- a/arch/arm/kernel/kgdb.c +++ b/arch/arm/kernel/kgdb.c @@ -160,12 +160,16 @@ static int kgdb_compiled_brk_fn(struct pt_regs *regs, unsigned int instr) static struct undef_hook kgdb_brkpt_hook = { .instr_mask = 0xffffffff, .instr_val = KGDB_BREAKINST, + .cpsr_mask = MODE_MASK, + .cpsr_val = SVC_MODE, .fn = kgdb_brk_fn }; static struct undef_hook kgdb_compiled_brkpt_hook = { .instr_mask = 0xffffffff, .instr_val = KGDB_COMPILED_BREAK, + .cpsr_mask = MODE_MASK, + .cpsr_val = SVC_MODE, .fn = kgdb_compiled_brk_fn }; -- 2.0.1
| |